diff options
Diffstat (limited to 'net/hsr')
| -rw-r--r-- | net/hsr/Kconfig | 27 | ||||
| -rw-r--r-- | net/hsr/Makefile | 7 | ||||
| -rw-r--r-- | net/hsr/hsr_device.c | 596 | ||||
| -rw-r--r-- | net/hsr/hsr_device.h | 29 | ||||
| -rw-r--r-- | net/hsr/hsr_framereg.c | 503 | ||||
| -rw-r--r-- | net/hsr/hsr_framereg.h | 53 | ||||
| -rw-r--r-- | net/hsr/hsr_main.c | 469 | ||||
| -rw-r--r-- | net/hsr/hsr_main.h | 166 | ||||
| -rw-r--r-- | net/hsr/hsr_netlink.c | 457 | ||||
| -rw-r--r-- | net/hsr/hsr_netlink.h | 30 |
10 files changed, 2337 insertions, 0 deletions
diff --git a/net/hsr/Kconfig b/net/hsr/Kconfig new file mode 100644 index 0000000..0d3d709 --- /dev/null +++ b/net/hsr/Kconfig @@ -0,0 +1,27 @@ +# +# IEC 62439-3 High-availability Seamless Redundancy +# + +config HSR + tristate "High-availability Seamless Redundancy (HSR)" + ---help--- + If you say Y here, then your Linux box will be able to act as a + DANH ("Doubly attached node implementing HSR"). For this to work, + your Linux box needs (at least) two physical Ethernet interfaces, + and it must be connected as a node in a ring network together with + other HSR capable nodes. + + All Ethernet frames sent over the hsr device will be sent in both + directions on the ring (over both slave ports), giving a redundant, + instant fail-over network. Each HSR node in the ring acts like a + bridge for HSR frames, but filters frames that have been forwarded + earlier. + + This code is a "best effort" to comply with the HSR standard as + described in IEC 62439-3:2010 (HSRv0), but no compliancy tests have + been made. + + You need to perform any and all necessary tests yourself before + relying on this code in a safety critical system! + + If unsure, say N. diff --git a/net/hsr/Makefile b/net/hsr/Makefile new file mode 100644 index 0000000..b68359f --- /dev/null +++ b/net/hsr/Makefile @@ -0,0 +1,7 @@ +# +# Makefile for HSR +# + +obj-$(CONFIG_HSR) += hsr.o + +hsr-y := hsr_main.o hsr_framereg.o hsr_device.o hsr_netlink.o diff --git a/net/hsr/hsr_device.c b/net/hsr/hsr_device.c new file mode 100644 index 0000000..cac505f --- /dev/null +++ b/net/hsr/hsr_device.c @@ -0,0 +1,596 @@ +/* Copyright 2011-2013 Autronica Fire and Security AS + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License as published by the Free + * Software Foundation; either version 2 of the License, or (at your option) + * any later version. + * + * Author(s): + * 2011-2013 Arvid Brodin, arvid.brodin@xdin.com + * + * This file contains device methods for creating, using and destroying + * virtual HSR devices. + */ + +#include <linux/netdevice.h> +#include <linux/skbuff.h> +#include <linux/etherdevice.h> +#include <linux/if_arp.h> +#include <linux/rtnetlink.h> +#include <linux/pkt_sched.h> +#include "hsr_device.h" +#include "hsr_framereg.h" +#include "hsr_main.h" + + +static bool is_admin_up(struct net_device *dev) +{ + return dev && (dev->flags & IFF_UP); +} + +static bool is_slave_up(struct net_device *dev) +{ + return dev && is_admin_up(dev) && netif_oper_up(dev); +} + +static void __hsr_set_operstate(struct net_device *dev, int transition) +{ + write_lock_bh(&dev_base_lock); + if (dev->operstate != transition) { + dev->operstate = transition; + write_unlock_bh(&dev_base_lock); + netdev_state_change(dev); + } else { + write_unlock_bh(&dev_base_lock); + } +} + +void hsr_set_operstate(struct net_device *hsr_dev, struct net_device *slave1, + struct net_device *slave2) +{ + if (!is_admin_up(hsr_dev)) { + __hsr_set_operstate(hsr_dev, IF_OPER_DOWN); + return; + } + + if (is_slave_up(slave1) || is_slave_up(slave2)) + __hsr_set_operstate(hsr_dev, IF_OPER_UP); + else + __hsr_set_operstate(hsr_dev, IF_OPER_LOWERLAYERDOWN); +} + +void hsr_set_carrier(struct net_device *hsr_dev, struct net_device *slave1, + struct net_device *slave2) +{ + if (is_slave_up(slave1) || is_slave_up(slave2)) + netif_carrier_on(hsr_dev); + else + netif_carrier_off(hsr_dev); +} + + +void hsr_check_announce(struct net_device *hsr_dev, int old_operstate) +{ + struct hsr_priv *hsr_priv; + + hsr_priv = netdev_priv(hsr_dev); + + if ((hsr_dev->operstate == IF_OPER_UP) && (old_operstate != IF_OPER_UP)) { + /* Went up */ + hsr_priv->announce_count = 0; + hsr_priv->announce_timer.expires = jiffies + + msecs_to_jiffies(HSR_ANNOUNCE_INTERVAL); + add_timer(&hsr_priv->announce_timer); + } + + if ((hsr_dev->operstate != IF_OPER_UP) && (old_operstate == IF_OPER_UP)) + /* Went down */ + del_timer(&hsr_priv->announce_timer); +} + + +int hsr_get_max_mtu(struct hsr_priv *hsr_priv) +{ + int mtu_max; + + if (hsr_priv->slave[0] && hsr_priv->slave[1]) + mtu_max = min(hsr_priv->slave[0]->mtu, hsr_priv->slave[1]->mtu); + else if (hsr_priv->slave[0]) + mtu_max = hsr_priv->slave[0]->mtu; + else if (hsr_priv->slave[1]) + mtu_max = hsr_priv->slave[1]->mtu; + else + mtu_max = HSR_TAGLEN; + + return mtu_max - HSR_TAGLEN; +} + +static int hsr_dev_change_mtu(struct net_device *dev, int new_mtu) +{ + struct hsr_priv *hsr_priv; + + hsr_priv = netdev_priv(dev); + + if (new_mtu > hsr_get_max_mtu(hsr_priv)) { + netdev_info(hsr_priv->dev, "A HSR master's MTU cannot be greater than the smallest MTU of its slaves minus the HSR Tag length (%d octets).\n", + HSR_TAGLEN); + return -EINVAL; + } + + dev->mtu = new_mtu; + + return 0; +} + +static int hsr_dev_open(struct net_device *dev) +{ + struct hsr_priv *hsr_priv; + int i; + char *slave_name; + + hsr_priv = netdev_priv(dev); + + for (i = 0; i < HSR_MAX_SLAVE; i++) { + if (hsr_priv->slave[i]) + slave_name = hsr_priv->slave[i]->name; + else + slave_name = "null"; + + if (!is_slave_up(hsr_priv->slave[i])) + netdev_warn(dev, "Slave %c (%s) is not up; please bring it up to get a working HSR network\n", + 'A' + i, slave_name); + } + + return 0; +} + +static int hsr_dev_close(struct net_device *dev) +{ + /* Nothing to do here. We could try to restore the state of the slaves + * to what they were before being changed by the hsr master dev's state, + * but they might have been changed manually in the mean time too, so + * taking them up or down here might be confusing and is probably not a + * good idea. + */ + return 0; +} + + +static void hsr_fill_tag(struct hsr_ethhdr *hsr_ethhdr, struct hsr_priv *hsr_priv) +{ + unsigned long irqflags; + + /* IEC 62439-1:2010, p 48, says the 4-bit "path" field can take values + * between 0001-1001 ("ring identifier", for regular HSR frames), + * or 1111 ("HSR management", supervision frames). Unfortunately, the + * spec writers forgot to explain what a "ring identifier" is, or + * how it is used. So we just set this to 0001 for regular frames, + * and 1111 for supervision frames. + */ + set_hsr_tag_path(&hsr_ethhdr->hsr_tag, 0x1); + + /* IEC 62439-1:2010, p 12: "The link service data unit in an Ethernet + * frame is the content of the frame located between the Length/Type + * field and the Frame Check Sequence." + * + * IEC 62439-3, p 48, specifies the "original LPDU" to include the + * original "LT" field (what "LT" means is not explained anywhere as + * far as I can see - perhaps "Length/Type"?). So LSDU_size might + * equal original length + 2. + * Also, the fact that this field is not used anywhere (might be used + * by a RedBox connecting HSR and PRP nets?) means I cannot test its + * correctness. Instead of guessing, I set this to 0 here, to make any + * problems immediately apparent. Anyone using this driver with PRP/HSR + * RedBoxes might need to fix this... + */ + set_hsr_tag_LSDU_size(&hsr_ethhdr->hsr_tag, 0); + + spin_lock_irqsave(&hsr_priv->seqnr_lock, irqflags); + hsr_ethhdr->hsr_tag.sequence_nr = htons(hsr_priv->sequence_nr); + hsr_priv->sequence_nr++; + spin_unlock_irqrestore(&hsr_priv->seqnr_lock, irqflags); + + hsr_ethhdr->hsr_tag.encap_proto = hsr_ethhdr->ethhdr.h_proto; + + hsr_ethhdr->ethhdr.h_proto = htons(ETH_P_PRP); +} + +static int slave_xmit(struct sk_buff *skb, struct hsr_priv *hsr_priv, + enum hsr_dev_idx dev_idx) +{ + struct hsr_ethhdr *hsr_ethhdr; + + hsr_ethhdr = (struct hsr_ethhdr *) skb->data; + + skb->dev = hsr_priv->slave[dev_idx]; + + hsr_addr_subst_dest(hsr_priv, &hsr_ethhdr->ethhdr, dev_idx); + + /* Address substitution (IEC62439-3 pp 26, 50): replace mac + * address of outgoing frame with that of the outgoing slave's. + */ + memcpy(hsr_ethhdr->ethhdr.h_source, skb->dev->dev_addr, ETH_ALEN); + + return dev_queue_xmit(skb); +} + + +static int hsr_dev_xmit(struct sk_buff *skb, struct net_device *dev) +{ + struct hsr_priv *hsr_priv; + struct hsr_ethhdr *hsr_ethhdr; + struct sk_buff *skb2; + int res1, res2; + + hsr_priv = netdev_priv(dev); + hsr_ethhdr = (struct hsr_ethhdr *) skb->data; + + if ((skb->protocol != htons(ETH_P_PRP)) || + (hsr_ethhdr->ethhdr.h_proto != htons(ETH_P_PRP))) { + hsr_fill_tag(hsr_ethhdr, hsr_priv); + skb->protocol = htons(ETH_P_PRP); + } + + skb2 = pskb_copy(skb, GFP_ATOMIC); + + res1 = NET_XMIT_DROP; + if (likely(hsr_priv->slave[HSR_DEV_SLAVE_A])) + res1 = slave_xmit(skb, hsr_priv, HSR_DEV_SLAVE_A); + + res2 = NET_XMIT_DROP; + if (likely(skb2 && hsr_priv->slave[HSR_DEV_SLAVE_B])) + res2 = slave_xmit(skb2, hsr_priv, HSR_DEV_SLAVE_B); + + if (likely(res1 == NET_XMIT_SUCCESS || res1 == NET_XMIT_CN || + res2 == NET_XMIT_SUCCESS || res2 == NET_XMIT_CN)) { + hsr_priv->dev->stats.tx_packets++; + hsr_priv->dev->stats.tx_bytes += skb->len; + } else { + hsr_priv->dev->stats.tx_dropped++; + } + + return NETDEV_TX_OK; +} + + +static int hsr_header_create(struct sk_buff *skb, struct net_device *dev, + unsigned short type, const void *daddr, + const void *saddr, unsigned int len) +{ + int res; + + /* Make room for the HSR tag now. We will fill it in later (in + * hsr_dev_xmit) + */ + if (skb_headroom(skb) < HSR_TAGLEN + ETH_HLEN) + return -ENOBUFS; + skb_push(skb, HSR_TAGLEN); + + /* To allow VLAN/HSR combos we should probably use + * res = dev_hard_header(skb, dev, type, daddr, saddr, len + HSR_TAGLEN); + * here instead. It would require other changes too, though - e.g. + * separate headers for each slave etc... + */ + res = eth_header(skb, dev, type, daddr, saddr, len + HSR_TAGLEN); + if (res <= 0) + return res; + skb_reset_mac_header(skb); + + return res + HSR_TAGLEN; +} + + +static const struct header_ops hsr_header_ops = { + .create = hsr_header_create, + .parse = eth_header_parse, +}; + + +/* HSR:2010 supervision frames should be padded so that the whole frame, + * including headers and FCS, is 64 bytes (without VLAN). + */ +static int hsr_pad(int size) +{ + const int min_size = ETH_ZLEN - HSR_TAGLEN - ETH_HLEN; + + if (size >= min_size) + return size; + return min_size; +} + +static void send_hsr_supervision_frame(struct net_device *hsr_dev, u8 type) +{ + struct hsr_priv *hsr_priv; + struct sk_buff *skb; + int hlen, tlen; + struct hsr_sup_tag *hsr_stag; + struct hsr_sup_payload *hsr_sp; + unsigned long irqflags; + + hlen = LL_RESERVED_SPACE(hsr_dev); + tlen = hsr_dev->needed_tailroom; + skb = alloc_skb(hsr_pad(sizeof(struct hsr_sup_payload)) + hlen + tlen, + GFP_ATOMIC); + + if (skb == NULL) + return; + + hsr_priv = netdev_priv(hsr_dev); + + skb_reserve(skb, hlen); + + skb->dev = hsr_dev; + skb->protocol = htons(ETH_P_PRP); + skb->priority = TC_PRIO_CONTROL; + + if (dev_hard_header(skb, skb->dev, ETH_P_PRP, + hsr_priv->sup_multicast_addr, + skb->dev->dev_addr, skb->len) < 0) + goto out; + + skb_pull(skb, sizeof(struct ethhdr)); + hsr_stag = (typeof(hsr_stag)) skb->data; + + set_hsr_stag_path(hsr_stag, 0xf); + set_hsr_stag_HSR_Ver(hsr_stag, 0); + + spin_lock_irqsave(&hsr_priv->seqnr_lock, irqflags); + hsr_stag->sequence_nr = htons(hsr_priv->sequence_nr); + hsr_priv->sequence_nr++; + spin_unlock_irqrestore(&hsr_priv->seqnr_lock, irqflags); + + hsr_stag->HSR_TLV_Type = type; + hsr_stag->HSR_TLV_Length = 12; + + skb_push(skb, sizeof(struct ethhdr)); + + /* Payload: MacAddressA */ + hsr_sp = (typeof(hsr_sp)) skb_put(skb, sizeof(*hsr_sp)); + memcpy(hsr_sp->MacAddressA, hsr_dev->dev_addr, ETH_ALEN); + + dev_queue_xmit(skb); + return; + +out: + kfree_skb(skb); +} + + +/* Announce (supervision frame) timer function + */ +static void hsr_announce(unsigned long data) +{ + struct hsr_priv *hsr_priv; + + hsr_priv = (struct hsr_priv *) data; + + if (hsr_priv->announce_count < 3) { + send_hsr_supervision_frame(hsr_priv->dev, HSR_TLV_ANNOUNCE); + hsr_priv->announce_count++; + } else { + send_hsr_supervision_frame(hsr_priv->dev, HSR_TLV_LIFE_CHECK); + } + + if (hsr_priv->announce_count < 3) + hsr_priv->announce_timer.expires = jiffies + + msecs_to_jiffies(HSR_ANNOUNCE_INTERVAL); + else + hsr_priv->announce_timer.expires = jiffies + + msecs_to_jiffies(HSR_LIFE_CHECK_INTERVAL); + + if (is_admin_up(hsr_priv->dev)) + add_timer(&hsr_priv->announce_timer); +} + + +static void restore_slaves(struct net_device *hsr_dev) +{ + struct hsr_priv *hsr_priv; + int i; + int res; + + hsr_priv = netdev_priv(hsr_dev); + + rtnl_lock(); + + /* Restore promiscuity */ + for (i = 0; i < HSR_MAX_SLAVE; i++) { + if (!hsr_priv->slave[i]) + continue; + res = dev_set_promiscuity(hsr_priv->slave[i], -1); + if (res) + netdev_info(hsr_dev, + "Cannot restore slave promiscuity (%s, %d)\n", + hsr_priv->slave[i]->name, res); + } + + rtnl_unlock(); +} + +static void reclaim_hsr_dev(struct rcu_head *rh) +{ + struct hsr_priv *hsr_priv; + + hsr_priv = container_of(rh, struct hsr_priv, rcu_head); + free_netdev(hsr_priv->dev); +} + + +/* According to comments in the declaration of struct net_device, this function + * is "Called from unregister, can be used to call free_netdev". Ok then... + */ +static void hsr_dev_destroy(struct net_device *hsr_dev) +{ + struct hsr_priv *hsr_priv; + + hsr_priv = netdev_priv(hsr_dev); + + del_timer(&hsr_priv->announce_timer); + unregister_hsr_master(hsr_priv); /* calls list_del_rcu on hsr_priv */ + restore_slaves(hsr_dev); + call_rcu(&hsr_priv->rcu_head, reclaim_hsr_dev); /* reclaim hsr_priv */ +} + +static const struct net_device_ops hsr_device_ops = { + .ndo_change_mtu = hsr_dev_change_mtu, + .ndo_open = hsr_dev_open, + .ndo_stop = hsr_dev_close, + .ndo_start_xmit = hsr_dev_xmit, +}; + + +void hsr_dev_setup(struct net_device *dev) +{ + random_ether_addr(dev->dev_addr); + + ether_setup(dev); + dev->header_ops = &hsr_header_ops; + dev->netdev_ops = &hsr_device_ops; + dev->tx_queue_len = 0; + + dev->destructor = hsr_dev_destroy; +} + + +/* Return true if dev is a HSR master; return false otherwise. + */ +bool is_hsr_master(struct net_device *dev) +{ + return (dev->netdev_ops->ndo_start_xmit == hsr_dev_xmit); +} + +static int check_slave_ok(struct net_device *dev) +{ + /* Don't allow HSR on non-ethernet like devices */ + if ((dev->flags & IFF_LOOPBACK) || (dev->type != ARPHRD_ETHER) || + (dev->addr_len != ETH_ALEN)) { + netdev_info(dev, "Cannot use loopback or non-ethernet device as HSR slave.\n"); + return -EINVAL; + } + + /* Don't allow enslaving hsr devices */ + if (is_hsr_master(dev)) { + netdev_info(dev, "Cannot create trees of HSR devices.\n"); + return -EINVAL; + } + + if (is_hsr_slave(dev)) { + netdev_info(dev, "This device is already a HSR slave.\n"); + return -EINVAL; + } + + if (dev->priv_flags & IFF_802_1Q_VLAN) { + netdev_info(dev, "HSR on top of VLAN is not yet supported in this driver.\n"); + return -EINVAL; + } + + /* HSR over bonded devices has not been tested, but I'm not sure it + * won't work... + */ + + return 0; +} + + +/* Default multicast address for HSR Supervision frames */ +static const unsigned char def_multicast_addr[ETH_ALEN] = { + 0x01, 0x15, 0x4e, 0x00, 0x01, 0x00 +}; + +int hsr_dev_finalize(struct net_device *hsr_dev, struct net_device *slave[2], + unsigned char multicast_spec) +{ + struct hsr_priv *hsr_priv; + int i; + int res; + + hsr_priv = netdev_priv(hsr_dev); + hsr_priv->dev = hsr_dev; + INIT_LIST_HEAD(&hsr_priv->node_db); + INIT_LIST_HEAD(&hsr_priv->self_node_db); + for (i = 0; i < HSR_MAX_SLAVE; i++) + hsr_priv->slave[i] = slave[i]; + + spin_lock_init(&hsr_priv->seqnr_lock); + /* Overflow soon to find bugs easier: */ + hsr_priv->sequence_nr = USHRT_MAX - 1024; + + init_timer(&hsr_priv->announce_timer); + hsr_priv->announce_timer.function = hsr_announce; + hsr_priv->announce_timer.data = (unsigned long) hsr_priv; + + memcpy(hsr_priv->sup_multicast_addr, def_multicast_addr, ETH_ALEN); + hsr_priv->sup_multicast_addr[ETH_ALEN - 1] = multicast_spec; + +/* FIXME: should I modify the value of these? + * + * - hsr_dev->flags - i.e. + * IFF_MASTER/SLAVE? + * - hsr_dev->priv_flags - i.e. + * IFF_EBRIDGE? + * IFF_TX_SKB_SHARING? + * IFF_HSR_MASTER/SLAVE? + */ + + for (i = 0; i < HSR_MAX_SLAVE; i++) { + res = check_slave_ok(slave[i]); + if (res) + return res; + } + + hsr_dev->features = slave[0]->features & slave[1]->features; + /* Prevent recursive tx locking */ + hsr_dev->features |= NETIF_F_LLTX; + /* VLAN on top of HSR needs testing and probably some work on + * hsr_header_create() etc. + */ + hsr_dev->features |= NETIF_F_VLAN_CHALLENGED; + + /* Set hsr_dev's MAC address to that of mac_slave1 */ + memcpy(hsr_dev->dev_addr, hsr_priv->slave[0]->dev_addr, ETH_ALEN); + + /* Set required header length */ + for (i = 0; i < HSR_MAX_SLAVE; i++) { + if (slave[i]->hard_header_len + HSR_TAGLEN > + hsr_dev->hard_header_len) + hsr_dev->hard_header_len = + slave[i]->hard_header_len + HSR_TAGLEN; + } + + /* MTU */ + for (i = 0; i < HSR_MAX_SLAVE; i++) + if (slave[i]->mtu - HSR_TAGLEN < hsr_dev->mtu) + hsr_dev->mtu = slave[i]->mtu - HSR_TAGLEN; + + /* Make sure the 1st call to netif_carrier_on() gets through */ + netif_carrier_off(hsr_dev); + + /* Promiscuity */ + for (i = 0; i < HSR_MAX_SLAVE; i++) { + res = dev_set_promiscuity(slave[i], 1); + if (res) { + netdev_info(hsr_dev, "Cannot set slave promiscuity (%s, %d)\n", + slave[i]->name, res); + goto fail; + } + } + + /* Make sure we recognize frames from ourselves in hsr_rcv() */ + res = hsr_create_self_node(&hsr_priv->self_node_db, + hsr_dev->dev_addr, + hsr_priv->slave[1]->dev_addr); + if (res < 0) + goto fail; + + res = register_netdevice(hsr_dev); + if (res) + goto fail; + + register_hsr_master(hsr_priv); + + return 0; + +fail: + restore_slaves(hsr_dev); + return res; +} diff --git a/net/hsr/hsr_device.h b/net/hsr/hsr_device.h new file mode 100644 index 0000000..2c7148e --- /dev/null +++ b/net/hsr/hsr_device.h @@ -0,0 +1,29 @@ +/* Copyright 2011-2013 Autronica Fire and Security AS + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License as published by the Free + * Software Foundation; either version 2 of the License, or (at your option) + * any later version. + * + * Author(s): + * 2011-2013 Arvid Brodin, arvid.brodin@xdin.com + */ + +#ifndef __HSR_DEVICE_H +#define __HSR_DEVICE_H + +#include <linux/netdevice.h> +#include "hsr_main.h" + +void hsr_dev_setup(struct net_device *dev); +int hsr_dev_finalize(struct net_device *hsr_dev, struct net_device *slave[2], + unsigned char multicast_spec); +void hsr_set_operstate(struct net_device *hsr_dev, struct net_device *slave1, + struct net_device *slave2); +void hsr_set_carrier(struct net_device *hsr_dev, struct net_device *slave1, + struct net_device *slave2); +void hsr_check_announce(struct net_device *hsr_dev, int old_operstate); +bool is_hsr_master(struct net_device *dev); +int hsr_get_max_mtu(struct hsr_priv *hsr_priv); + +#endif /* __HSR_DEVICE_H */ diff --git a/net/hsr/hsr_framereg.c b/net/hsr/hsr_framereg.c new file mode 100644 index 0000000..003f5bb --- /dev/null +++ b/net/hsr/hsr_framereg.c @@ -0,0 +1,503 @@ +/* Copyright 2011-2013 Autronica Fire and Security AS + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License as published by the Free + * Software Foundation; either version 2 of the License, or (at your option) + * any later version. + * + * Author(s): + * 2011-2013 Arvid Brodin, arvid.brodin@xdin.com + * + * The HSR spec says never to forward the same frame twice on the same + * interface. A frame is identified by its source MAC address and its HSR + * sequence number. This code keeps track of senders and their sequence numbers + * to allow filtering of duplicate frames, and to detect HSR ring errors. + */ + +#include <linux/if_ether.h> +#include <linux/etherdevice.h> +#include <linux/slab.h> +#include <linux/rculist.h> +#include "hsr_main.h" +#include "hsr_framereg.h" +#include "hsr_netlink.h" + + +struct node_entry { + struct list_head mac_list; + unsigned char MacAddressA[ETH_ALEN]; + unsigned char MacAddressB[ETH_ALEN]; + enum hsr_dev_idx AddrB_if; /* The local slave through which AddrB + * frames are received from this node + */ + unsigned long time_in[HSR_MAX_SLAVE]; + bool time_in_stale[HSR_MAX_SLAVE]; + u16 seq_out[HSR_MAX_DEV]; + struct rcu_head rcu_head; +}; + +/* TODO: use hash lists for mac addresses (linux/jhash.h)? */ + + + +/* Search for mac entry. Caller must hold rcu read lock. + */ +static struct node_entry *find_node_by_AddrA(struct list_head *node_db, + const unsigned char addr[ETH_ALEN]) +{ + struct node_entry *node; + + list_for_each_entry_rcu(node, node_db, mac_list) { + if (ether_addr_equal(node->MacAddressA, addr)) + return node; + } + + return NULL; +} + + +/* Search for mac entry. Caller must hold rcu read lock. + */ +static struct node_entry *find_node_by_AddrB(struct list_head *node_db, + const unsigned char addr[ETH_ALEN]) +{ + struct node_entry *node; + + list_for_each_entry_rcu(node, node_db, mac_list) { + if (ether_addr_equal(node->MacAddressB, addr)) + return node; + } + + return NULL; +} + + +/* Search for mac entry. Caller must hold rcu read lock. + */ +struct node_entry *hsr_find_node(struct list_head *node_db, struct sk_buff *skb) +{ + struct node_entry *node; + struct ethhdr *ethhdr; + + if (!skb_mac_header_was_set(skb)) + return NULL; + + ethhdr = (struct ethhdr *) skb_mac_header(skb); + + list_for_each_entry_rcu(node, node_db, mac_list) { + if (ether_addr_equal(node->MacAddressA, ethhdr->h_source)) + return node; + if (ether_addr_equal(node->MacAddressB, ethhdr->h_source)) + return node; + } + + return NULL; +} + + +/* Helper for device init; the self_node_db is used in hsr_rcv() to recognize + * frames from self that's been looped over the HSR ring. + */ +int hsr_create_self_node(struct list_head *self_node_db, + unsigned char addr_a[ETH_ALEN], + unsigned char addr_b[ETH_ALEN]) +{ + struct node_entry *node, *oldnode; + + node = kmalloc(sizeof(*node), GFP_KERNEL); + if (!node) + return -ENOMEM; + + memcpy(node->MacAddressA, addr_a, ETH_ALEN); + memcpy(node->MacAddressB, addr_b, ETH_ALEN); + + rcu_read_lock(); + oldnode = list_first_or_null_rcu(self_node_db, + struct node_entry, mac_list); + if (oldnode) { + list_replace_rcu(&oldnode->mac_list, &node->mac_list); + rcu_read_unlock(); + synchronize_rcu(); + kfree(oldnode); + } else { + rcu_read_unlock(); + list_add_tail_rcu(&node->mac_list, self_node_db); + } + + return 0; +} + +static void node_entry_reclaim(struct rcu_head *rh) +{ + kfree(container_of(rh, struct node_entry, rcu_head)); +} + + +/* Add/merge node to the database of nodes. 'skb' must contain an HSR + * supervision frame. + * - If the supervision header's MacAddressA field is not yet in the database, + * this frame is from an hitherto unknown node - add it to the database. + * - If the sender's MAC address is not the same as its MacAddressA address, + * the node is using PICS_SUBS (address substitution). Record the sender's + * address as the node's MacAddressB. + * + * This function needs to work even if the sender node has changed one of its + * slaves' MAC addresses. In this case, there are four different cases described + * by (Addr-changed, received-from) pairs as follows. Note that changing the + * SlaveA address is equal to changing the node's own address: + * + * - (AddrB, SlaveB): The new AddrB will be recorded by PICS_SUBS code since + * node == NULL. + * - (AddrB, SlaveA): Will work as usual (the AddrB change won't be detected + * from this frame). + * + * - (AddrA, SlaveB): The old node will be found. We need to detect this and + * remove the node. + * - (AddrA, SlaveA): A new node will be registered (non-PICS_SUBS at first). + * The old one will be pruned after HSR_NODE_FORGET_TIME. + * + * We also need to detect if the sender's SlaveA and SlaveB cables have been + * swapped. + */ +struct node_entry *hsr_merge_node(struct hsr_priv *hsr_priv, + struct node_entry *node, + struct sk_buff *skb, + enum hsr_dev_idx dev_idx) +{ + struct hsr_sup_payload *hsr_sp; + struct hsr_ethhdr_sp *hsr_ethsup; + int i; + unsigned long now; + + hsr_ethsup = (struct hsr_ethhdr_sp *) skb_mac_header(skb); + hsr_sp = (struct hsr_sup_payload *) skb->data; + + if (node && !ether_addr_equal(node->MacAddressA, hsr_sp->MacAddressA)) { + /* Node has changed its AddrA, frame was received from SlaveB */ + list_del_rcu(&node->mac_list); + call_rcu(&node->rcu_head, node_entry_reclaim); + node = NULL; + } + + if (node && (dev_idx == node->AddrB_if) && + !ether_addr_equal(node->MacAddressB, hsr_ethsup->ethhdr.h_source)) { + /* Cables have been swapped */ + list_del_rcu(&node->mac_list); + call_rcu(&node->rcu_head, node_entry_reclaim); + node = NULL; + } + + if (node && (dev_idx != node->AddrB_if) && + (node->AddrB_if != HSR_DEV_NONE) && + !ether_addr_equal(node->MacAddressA, hsr_ethsup->ethhdr.h_source)) { + /* Cables have been swapped */ + list_del_rcu(&node->mac_list); + call_rcu(&node->rcu_head, node_entry_reclaim); + node = NULL; + } + + if (node) + return node; + + node = find_node_by_AddrA(&hsr_priv->node_db, hsr_sp->MacAddressA); + if (node) { + /* Node is known, but frame was received from an unknown + * address. Node is PICS_SUBS capable; merge its AddrB. + */ + memcpy(node->MacAddressB, hsr_ethsup->ethhdr.h_source, ETH_ALEN); + node->AddrB_if = dev_idx; + return node; + } + + node = kzalloc(sizeof(*node), GFP_ATOMIC); + if (!node) + return NULL; + + memcpy(node->MacAddressA, hsr_sp->MacAddressA, ETH_ALEN); + memcpy(node->MacAddressB, hsr_ethsup->ethhdr.h_source, ETH_ALEN); + if (!ether_addr_equal(hsr_sp->MacAddressA, hsr_ethsup->ethhdr.h_source)) + node->AddrB_if = dev_idx; + else + node->AddrB_if = HSR_DEV_NONE; + + /* We are only interested in time diffs here, so use current jiffies + * as initialization. (0 could trigger an spurious ring error warning). + */ + now = jiffies; + for (i = 0; i < HSR_MAX_SLAVE; i++) + node->time_in[i] = now; + for (i = 0; i < HSR_MAX_DEV; i++) + node->seq_out[i] = ntohs(hsr_ethsup->hsr_sup.sequence_nr) - 1; + + list_add_tail_rcu(&node->mac_list, &hsr_priv->node_db); + + return node; +} + + +/* 'skb' is a frame meant for this host, that is to be passed to upper layers. + * + * If the frame was sent by a node's B interface, replace the sender + * address with that node's "official" address (MacAddressA) so that upper + * layers recognize where it came from. + */ +void hsr_addr_subst_source(struct hsr_priv *hsr_priv, struct sk_buff *skb) +{ + struct ethhdr *ethhdr; + struct node_entry *node; + + if (!skb_mac_header_was_set(skb)) { + WARN_ONCE(1, "%s: Mac header not set\n", __func__); + return; + } + ethhdr = (struct ethhdr *) skb_mac_header(skb); + + rcu_read_lock(); + node = find_node_by_AddrB(&hsr_priv->node_db, ethhdr->h_source); + if (node) + memcpy(ethhdr->h_source, node->MacAddressA, ETH_ALEN); + rcu_read_unlock(); +} + + +/* 'skb' is a frame meant for another host. + * 'hsr_dev_idx' is the HSR index of the outgoing device + * + * Substitute the target (dest) MAC address if necessary, so the it matches the + * recipient interface MAC address, regardless of whether that is the + * recipient's A or B interface. + * This is needed to keep the packets flowing through switches that learn on + * which "side" the different interfaces are. + */ +void hsr_addr_subst_dest(struct hsr_priv *hsr_priv, struct ethhdr *ethhdr, + enum hsr_dev_idx dev_idx) +{ + struct node_entry *node; + + rcu_read_lock(); + node = find_node_by_AddrA(&hsr_priv->node_db, ethhdr->h_dest); + if (node && (node->AddrB_if == dev_idx)) + memcpy(ethhdr->h_dest, node->MacAddressB, ETH_ALEN); + rcu_read_unlock(); +} + + +/* seq_nr_after(a, b) - return true if a is after (higher in sequence than) b, + * false otherwise. + */ +static bool seq_nr_after(u16 a, u16 b) +{ + /* Remove inconsistency where + * seq_nr_after(a, b) == seq_nr_before(a, b) */ + if ((int) b - a == 32768) + return false; + + return (((s16) (b - a)) < 0); +} +#define seq_nr_before(a, b) seq_nr_after((b), (a)) +#define seq_nr_after_or_eq(a, b) (!seq_nr_before((a), (b))) +#define seq_nr_before_or_eq(a, b) (!seq_nr_after((a), (b))) + + +void hsr_register_frame_in(struct node_entry *node, enum hsr_dev_idx dev_idx) +{ + if ((dev_idx < 0) || (dev_idx >= HSR_MAX_DEV)) { + WARN_ONCE(1, "%s: Invalid dev_idx (%d)\n", __func__, dev_idx); + return; + } + node->time_in[dev_idx] = jiffies; + node->time_in_stale[dev_idx] = false; +} + + +/* 'skb' is a HSR Ethernet frame (with a HSR tag inserted), with a valid + * ethhdr->h_source address and skb->mac_header set. + * + * Return: + * 1 if frame can be shown to have been sent recently on this interface, + * 0 otherwise, or + * negative error code on error + */ +int hsr_register_frame_out(struct node_entry *node, enum hsr_dev_idx dev_idx, + struct sk_buff *skb) +{ + struct hsr_ethhdr *hsr_ethhdr; + u16 sequence_nr; + + if ((dev_idx < 0) || (dev_idx >= HSR_MAX_DEV)) { + WARN_ONCE(1, "%s: Invalid dev_idx (%d)\n", __func__, dev_idx); + return -EINVAL; + } + if (!skb_mac_header_was_set(skb)) { + WARN_ONCE(1, "%s: Mac header not set\n", __func__); + return -EINVAL; + } + hsr_ethhdr = (struct hsr_ethhdr *) skb_mac_header(skb); + + sequence_nr = ntohs(hsr_ethhdr->hsr_tag.sequence_nr); + if (seq_nr_before_or_eq(sequence_nr, node->seq_out[dev_idx])) + return 1; + + node->seq_out[dev_idx] = sequence_nr; + return 0; +} + + + +static bool is_late(struct node_entry *node, enum hsr_dev_idx dev_idx) +{ + enum hsr_dev_idx other; + + if (node->time_in_stale[dev_idx]) + return true; + + if (dev_idx == HSR_DEV_SLAVE_A) + other = HSR_DEV_SLAVE_B; + else + other = HSR_DEV_SLAVE_A; + + if (node->time_in_stale[other]) + return false; + + if (time_after(node->time_in[other], node->time_in[dev_idx] + + msecs_to_jiffies(MAX_SLAVE_DIFF))) + return true; + + return false; +} + + +/* Remove stale sequence_nr records. Called by timer every + * HSR_LIFE_CHECK_INTERVAL (two seconds or so). + */ +void hsr_prune_nodes(struct hsr_priv *hsr_priv) +{ + struct node_entry *node; + unsigned long timestamp; + unsigned long time_a, time_b; + + rcu_read_lock(); + list_for_each_entry_rcu(node, &hsr_priv->node_db, mac_list) { + /* Shorthand */ + time_a = node->time_in[HSR_DEV_SLAVE_A]; + time_b = node->time_in[HSR_DEV_SLAVE_B]; + + /* Check for timestamps old enough to risk wrap-around */ + if (time_after(jiffies, time_a + MAX_JIFFY_OFFSET/2)) + node->time_in_stale[HSR_DEV_SLAVE_A] = true; + if (time_after(jiffies, time_b + MAX_JIFFY_OFFSET/2)) + node->time_in_stale[HSR_DEV_SLAVE_B] = true; + + /* Get age of newest frame from node. + * At least one time_in is OK here; nodes get pruned long + * before both time_ins can get stale + */ + timestamp = time_a; + if (node->time_in_stale[HSR_DEV_SLAVE_A] || + (!node->time_in_stale[HSR_DEV_SLAVE_B] && + time_after(time_b, time_a))) + timestamp = time_b; + + /* Warn of ring error only as long as we get frames at all */ + if (time_is_after_jiffies(timestamp + + msecs_to_jiffies(1.5*MAX_SLAVE_DIFF))) { + + if (is_late(node, HSR_DEV_SLAVE_A)) + hsr_nl_ringerror(hsr_priv, node->MacAddressA, + HSR_DEV_SLAVE_A); + else if (is_late(node, HSR_DEV_SLAVE_B)) + hsr_nl_ringerror(hsr_priv, node->MacAddressA, + HSR_DEV_SLAVE_B); + } + + /* Prune old entries */ + if (time_is_before_jiffies(timestamp + + msecs_to_jiffies(HSR_NODE_FORGET_TIME))) { + hsr_nl_nodedown(hsr_priv, node->MacAddressA); + list_del_rcu(&node->mac_list); + /* Note that we need to free this entry later: */ + call_rcu(&node->rcu_head, node_entry_reclaim); + } + } + rcu_read_unlock(); +} + + +void *hsr_get_next_node(struct hsr_priv *hsr_priv, void *_pos, + unsigned char addr[ETH_ALEN]) +{ + struct node_entry *node; + + if (!_pos) { + node = list_first_or_null_rcu(&hsr_priv->node_db, + struct node_entry, mac_list); + if (node) + memcpy(addr, node->MacAddressA, ETH_ALEN); + return node; + } + + node = _pos; + list_for_each_entry_continue_rcu(node, &hsr_priv->node_db, mac_list) { + memcpy(addr, node->MacAddressA, ETH_ALEN); + return node; + } + + return NULL; +} + + +int hsr_get_node_data(struct hsr_priv *hsr_priv, + const unsigned char *addr, + unsigned char addr_b[ETH_ALEN], + unsigned int *addr_b_ifindex, + int *if1_age, + u16 *if1_seq, + int *if2_age, + u16 *if2_seq) +{ + struct node_entry *node; + unsigned long tdiff; + + + rcu_read_lock(); + node = find_node_by_AddrA(&hsr_priv->node_db, addr); + if (!node) { + rcu_read_unlock(); + return -ENOENT; /* No such entry */ + } + + memcpy(addr_b, node->MacAddressB, ETH_ALEN); + + tdiff = jiffies - node->time_in[HSR_DEV_SLAVE_A]; + if (node->time_in_stale[HSR_DEV_SLAVE_A]) + *if1_age = INT_MAX; +#if HZ <= MSEC_PER_SEC + else if (tdiff > msecs_to_jiffies(INT_MAX)) + *if1_age = INT_MAX; +#endif + else + *if1_age = jiffies_to_msecs(tdiff); + + tdiff = jiffies - node->time_in[HSR_DEV_SLAVE_B]; + if (node->time_in_stale[HSR_DEV_SLAVE_B]) + *if2_age = INT_MAX; +#if HZ <= MSEC_PER_SEC + else if (tdiff > msecs_to_jiffies(INT_MAX)) + *if2_age = INT_MAX; +#endif + else + *if2_age = jiffies_to_msecs(tdiff); + + /* Present sequence numbers as if they were incoming on interface */ + *if1_seq = node->seq_out[HSR_DEV_SLAVE_B]; + *if2_seq = node->seq_out[HSR_DEV_SLAVE_A]; + + if ((node->AddrB_if != HSR_DEV_NONE) && hsr_priv->slave[node->AddrB_if]) + *addr_b_ifindex = hsr_priv->slave[node->AddrB_if]->ifindex; + else + *addr_b_ifindex = -1; + + rcu_read_unlock(); + + return 0; +} diff --git a/net/hsr/hsr_framereg.h b/net/hsr/hsr_framereg.h new file mode 100644 index 0000000..e6c4022 --- /dev/null +++ b/net/hsr/hsr_framereg.h @@ -0,0 +1,53 @@ +/* Copyright 2011-2013 Autronica Fire and Security AS + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License as published by the Free + * Software Foundation; either version 2 of the License, or (at your option) + * any later version. + * + * Author(s): + * 2011-2013 Arvid Brodin, arvid.brodin@xdin.com + */ + +#ifndef _HSR_FRAMEREG_H +#define _HSR_FRAMEREG_H + +#include "hsr_main.h" + +struct node_entry; + +struct node_entry *hsr_find_node(struct list_head *node_db, struct sk_buff *skb); + +struct node_entry *hsr_merge_node(struct hsr_priv *hsr_priv, + struct node_entry *node, + struct sk_buff *skb, + enum hsr_dev_idx dev_idx); + +void hsr_addr_subst_source(struct hsr_priv *hsr_priv, struct sk_buff *skb); +void hsr_addr_subst_dest(struct hsr_priv *hsr_priv, struct ethhdr *ethhdr, + enum hsr_dev_idx dev_idx); + +void hsr_register_frame_in(struct node_entry *node, enum hsr_dev_idx dev_idx); + +int hsr_register_frame_out(struct node_entry *node, enum hsr_dev_idx dev_idx, + struct sk_buff *skb); + +void hsr_prune_nodes(struct hsr_priv *hsr_priv); + +int hsr_create_self_node(struct list_head *self_node_db, + unsigned char addr_a[ETH_ALEN], + unsigned char addr_b[ETH_ALEN]); + +void *hsr_get_next_node(struct hsr_priv *hsr_priv, void *_pos, + unsigned char addr[ETH_ALEN]); + +int hsr_get_node_data(struct hsr_priv *hsr_priv, + const unsigned char *addr, + unsigned char addr_b[ETH_ALEN], + unsigned int *addr_b_ifindex, + int *if1_age, + u16 *if1_seq, + int *if2_age, + u16 *if2_seq); + +#endif /* _HSR_FRAMEREG_H */ diff --git a/net/hsr/hsr_main.c b/net/hsr/hsr_main.c new file mode 100644 index 0000000..af68dd8 --- /dev/null +++ b/net/hsr/hsr_main.c @@ -0,0 +1,469 @@ +/* Copyright 2011-2013 Autronica Fire and Security AS + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License as published by the Free + * Software Foundation; either version 2 of the License, or (at your option) + * any later version. + * + * Author(s): + * 2011-2013 Arvid Brodin, arvid.brodin@xdin.com + * + * In addition to routines for registering and unregistering HSR support, this + * file also contains the receive routine that handles all incoming frames with + * Ethertype (protocol) ETH_P_PRP (HSRv0), and network device event handling. + */ + +#include <linux/netdevice.h> +#include <linux/rculist.h> +#include <linux/timer.h> +#include <linux/etherdevice.h> +#include "hsr_main.h" +#include "hsr_device.h" +#include "hsr_netlink.h" +#include "hsr_framereg.h" + + +/* List of all registered virtual HSR devices */ +static LIST_HEAD(hsr_list); + +void register_hsr_master(struct hsr_priv *hsr_priv) +{ + list_add_tail_rcu(&hsr_priv->hsr_list, &hsr_list); +} + +void unregister_hsr_master(struct hsr_priv *hsr_priv) +{ + struct hsr_priv *hsr_priv_it; + + list_for_each_entry(hsr_priv_it, &hsr_list, hsr_list) + if (hsr_priv_it == hsr_priv) { + list_del_rcu(&hsr_priv_it->hsr_list); + return; + } +} + +bool is_hsr_slave(struct net_device *dev) +{ + struct hsr_priv *hsr_priv_it; + + list_for_each_entry_rcu(hsr_priv_it, &hsr_list, hsr_list) { + if (dev == hsr_priv_it->slave[0]) + return true; + if (dev == hsr_priv_it->slave[1]) + return true; + } + + return false; +} + + +/* If dev is a HSR slave device, return the virtual master device. Return NULL + * otherwise. + */ +static struct hsr_priv *get_hsr_master(struct net_device *dev) +{ + struct hsr_priv *hsr_priv; + + rcu_read_lock(); + list_for_each_entry_rcu(hsr_priv, &hsr_list, hsr_list) + if ((dev == hsr_priv->slave[0]) || + (dev == hsr_priv->slave[1])) { + rcu_read_unlock(); + return hsr_priv; + } + + rcu_read_unlock(); + return NULL; +} + + +/* If dev is a HSR slave device, return the other slave device. Return NULL + * otherwise. + */ +static struct net_device *get_other_slave(struct hsr_priv *hsr_priv, + struct net_device *dev) +{ + if (dev == hsr_priv->slave[0]) + return hsr_priv->slave[1]; + if (dev == hsr_priv->slave[1]) + return hsr_priv->slave[0]; + + return NULL; +} + + +static int hsr_netdev_notify(struct notifier_block *nb, unsigned long event, + void *ptr) +{ + struct net_device *slave, *other_slave; + struct hsr_priv *hsr_priv; + int old_operstate; + int mtu_max; + int res; + struct net_device *dev; + + dev = netdev_notifier_info_to_dev(ptr); + + hsr_priv = get_hsr_master(dev); + if (hsr_priv) { + /* dev is a slave device */ + slave = dev; + other_slave = get_other_slave(hsr_priv, slave); + } else { + if (!is_hsr_master(dev)) + return NOTIFY_DONE; + hsr_priv = netdev_priv(dev); + slave = hsr_priv->slave[0]; + other_slave = hsr_priv->slave[1]; + } + + switch (event) { + case NETDEV_UP: /* Administrative state DOWN */ + case NETDEV_DOWN: /* Administrative state UP */ + case NETDEV_CHANGE: /* Link (carrier) state changes */ + old_operstate = hsr_priv->dev->operstate; + hsr_set_carrier(hsr_priv->dev, slave, other_slave); + /* netif_stacked_transfer_operstate() cannot be used here since + * it doesn't set IF_OPER_LOWERLAYERDOWN (?) + */ + hsr_set_operstate(hsr_priv->dev, slave, other_slave); + hsr_check_announce(hsr_priv->dev, old_operstate); + break; + case NETDEV_CHANGEADDR: + + /* This should not happen since there's no ndo_set_mac_address() + * for HSR devices - i.e. not supported. + */ + if (dev == hsr_priv->dev) + break; + + if (dev == hsr_priv->slave[0]) + memcpy(hsr_priv->dev->dev_addr, + hsr_priv->slave[0]->dev_addr, ETH_ALEN); + + /* Make sure we recognize frames from ourselves in hsr_rcv() */ + res = hsr_create_self_node(&hsr_priv->self_node_db, + hsr_priv->dev->dev_addr, + hsr_priv->slave[1] ? + hsr_priv->slave[1]->dev_addr : + hsr_priv->dev->dev_addr); + if (res) + netdev_warn(hsr_priv->dev, + "Could not update HSR node address.\n"); + + if (dev == hsr_priv->slave[0]) + call_netdevice_notifiers(NETDEV_CHANGEADDR, hsr_priv->dev); + break; + case NETDEV_CHANGEMTU: + if (dev == hsr_priv->dev) + break; /* Handled in ndo_change_mtu() */ + mtu_max = hsr_get_max_mtu(hsr_priv); + if (hsr_priv->dev->mtu > mtu_max) + dev_set_mtu(hsr_priv->dev, mtu_max); + break; + case NETDEV_UNREGISTER: + if (dev == hsr_priv->slave[0]) + hsr_priv->slave[0] = NULL; + if (dev == hsr_priv->slave[1]) + hsr_priv->slave[1] = NULL; + + /* There should really be a way to set a new slave device... */ + + break; + case NETDEV_PRE_TYPE_CHANGE: + /* HSR works only on Ethernet devices. Refuse slave to change + * its type. + */ + return NOTIFY_BAD; + } + + return NOTIFY_DONE; +} + + +static struct timer_list prune_timer; + +static void prune_nodes_all(unsigned long data) +{ + struct hsr_priv *hsr_priv; + + rcu_read_lock(); + list_for_each_entry_rcu(hsr_priv, &hsr_list, hsr_list) + hsr_prune_nodes(hsr_priv); + rcu_read_unlock(); + + prune_timer.expires = jiffies + msecs_to_jiffies(PRUNE_PERIOD); + add_timer(&prune_timer); +} + + +static struct sk_buff *hsr_pull_tag(struct sk_buff *skb) +{ + struct hsr_tag *hsr_tag; + struct sk_buff *skb2; + + skb2 = skb_share_check(skb, GFP_ATOMIC); + if (unlikely(!skb2)) + goto err_free; + skb = skb2; + + if (unlikely(!pskb_may_pull(skb, HSR_TAGLEN))) + goto err_free; + + hsr_tag = (struct hsr_tag *) skb->data; + skb->protocol = hsr_tag->encap_proto; + skb_pull(skb, HSR_TAGLEN); + + return skb; + +err_free: + kfree_skb(skb); + return NULL; +} + + +/* The uses I can see for these HSR supervision frames are: + * 1) Use the frames that are sent after node initialization ("HSR_TLV.Type = + * 22") to reset any sequence_nr counters belonging to that node. Useful if + * the other node's counter has been reset for some reason. + * -- + * Or not - resetting the counter and bridging the frame would create a + * loop, unfortunately. + * + * 2) Use the LifeCheck frames to detect ring breaks. I.e. if no LifeCheck + * frame is received from a particular node, we know something is wrong. + * We just register these (as with normal frames) and throw them away. + * + * 3) Allow different MAC addresses for the two slave interfaces, using the + * MacAddressA field. + */ +static bool is_supervision_frame(struct hsr_priv *hsr_priv, struct sk_buff *skb) +{ + struct hsr_sup_tag *hsr_stag; + + if (!ether_addr_equal(eth_hdr(skb)->h_dest, + hsr_priv->sup_multicast_addr)) + return false; + + hsr_stag = (struct hsr_sup_tag *) skb->data; + if (get_hsr_stag_path(hsr_stag) != 0x0f) + return false; + if ((hsr_stag->HSR_TLV_Type != HSR_TLV_ANNOUNCE) && + (hsr_stag->HSR_TLV_Type != HSR_TLV_LIFE_CHECK)) + return false; + if (hsr_stag->HSR_TLV_Length != 12) + return false; + + return true; +} + + +/* Implementation somewhat according to IEC-62439-3, p. 43 + */ +static int hsr_rcv(struct sk_buff *skb, struct net_device *dev, + struct packet_type *pt, struct net_device *orig_dev) +{ + struct hsr_priv *hsr_priv; + struct net_device *other_slave; + struct node_entry *node; + bool deliver_to_self; + struct sk_buff *skb_deliver; + enum hsr_dev_idx dev_in_idx, dev_other_idx; + bool dup_out; + int ret; + + hsr_priv = get_hsr_master(dev); + + if (!hsr_priv) { + /* Non-HSR-slave device 'dev' is connected to a HSR network */ + kfree_skb(skb); + dev->stats.rx_errors++; + return NET_RX_SUCCESS; + } + + if (dev == hsr_priv->slave[0]) { + dev_in_idx = HSR_DEV_SLAVE_A; + dev_other_idx = HSR_DEV_SLAVE_B; + } else { + dev_in_idx = HSR_DEV_SLAVE_B; + dev_other_idx = HSR_DEV_SLAVE_A; + } + + node = hsr_find_node(&hsr_priv->self_node_db, skb); + if (node) { + /* Always kill frames sent by ourselves */ + kfree_skb(skb); + return NET_RX_SUCCESS; + } + + /* Is this frame a candidate for local reception? */ + deliver_to_self = false; + if ((skb->pkt_type == PACKET_HOST) || + (skb->pkt_type == PACKET_MULTICAST) || + (skb->pkt_type == PACKET_BROADCAST)) + deliver_to_self = true; + else if (ether_addr_equal(eth_hdr(skb)->h_dest, + hsr_priv->dev->dev_addr)) { + skb->pkt_type = PACKET_HOST; + deliver_to_self = true; + } + + + rcu_read_lock(); /* node_db */ + node = hsr_find_node(&hsr_priv->node_db, skb); + + if (is_supervision_frame(hsr_priv, skb)) { + skb_pull(skb, sizeof(struct hsr_sup_tag)); + node = hsr_merge_node(hsr_priv, node, skb, dev_in_idx); + if (!node) { + rcu_read_unlock(); /* node_db */ + kfree_skb(skb); + hsr_priv->dev->stats.rx_dropped++; + return NET_RX_DROP; + } + skb_push(skb, sizeof(struct hsr_sup_tag)); + deliver_to_self = false; + } + + if (!node) { + /* Source node unknown; this might be a HSR frame from + * another net (different multicast address). Ignore it. + */ + rcu_read_unlock(); /* node_db */ + kfree_skb(skb); + return NET_RX_SUCCESS; + } + + /* Register ALL incoming frames as outgoing through the other interface. + * This allows us to register frames as incoming only if they are valid + * for the receiving interface, without using a specific counter for + * incoming frames. + */ + dup_out = hsr_register_frame_out(node, dev_other_idx, skb); + if (!dup_out) + hsr_register_frame_in(node, dev_in_idx); + + /* Forward this frame? */ + if (!dup_out && (skb->pkt_type != PACKET_HOST)) + other_slave = get_other_slave(hsr_priv, dev); + else + other_slave = NULL; + + if (hsr_register_frame_out(node, HSR_DEV_MASTER, skb)) + deliver_to_self = false; + + rcu_read_unlock(); /* node_db */ + + if (!deliver_to_self && !other_slave) { + kfree_skb(skb); + /* Circulated frame; silently remove it. */ + return NET_RX_SUCCESS; + } + + skb_deliver = skb; + if (deliver_to_self && other_slave) { + /* skb_clone() is not enough since we will strip the hsr tag + * and do address substitution below + */ + skb_deliver = pskb_copy(skb, GFP_ATOMIC); + if (!skb_deliver) { + deliver_to_self = false; + hsr_priv->dev->stats.rx_dropped++; + } + } + + if (deliver_to_self) { + bool multicast_frame; + + skb_deliver = hsr_pull_tag(skb_deliver); + if (!skb_deliver) { + hsr_priv->dev->stats.rx_dropped++; + goto forward; + } +#if !defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) + /* Move everything in the header that is after the HSR tag, + * to work around alignment problems caused by the 6-byte HSR + * tag. In practice, this removes/overwrites the HSR tag in + * the header and restores a "standard" packet. + */ + memmove(skb_deliver->data - HSR_TAGLEN, skb_deliver->data, + skb_headlen(skb_deliver)); + + /* Adjust skb members so they correspond with the move above. + * This cannot possibly underflow skb->data since hsr_pull_tag() + * above succeeded. + * At this point in the protocol stack, the transport and + * network headers have not been set yet, and we haven't touched + * the mac header nor the head. So we only need to adjust data + * and tail: + */ + skb_deliver->data -= HSR_TAGLEN; + skb_deliver->tail -= HSR_TAGLEN; +#endif + skb_deliver->dev = hsr_priv->dev; + hsr_addr_subst_source(hsr_priv, skb_deliver); + multicast_frame = (skb_deliver->pkt_type == PACKET_MULTICAST); + ret = netif_rx(skb_deliver); + if (ret == NET_RX_DROP) { + hsr_priv->dev->stats.rx_dropped++; + } else { + hsr_priv->dev->stats.rx_packets++; + hsr_priv->dev->stats.rx_bytes += skb->len; + if (multicast_frame) + hsr_priv->dev->stats.multicast++; + } + } + +forward: + if (other_slave) { + skb_push(skb, ETH_HLEN); + skb->dev = other_slave; + dev_queue_xmit(skb); + } + + return NET_RX_SUCCESS; +} + + +static struct packet_type hsr_pt __read_mostly = { + .type = htons(ETH_P_PRP), + .func = hsr_rcv, +}; + +static struct notifier_block hsr_nb = { + .notifier_call = hsr_netdev_notify, /* Slave event notifications */ +}; + + +static int __init hsr_init(void) +{ + int res; + + BUILD_BUG_ON(sizeof(struct hsr_tag) != HSR_TAGLEN); + + dev_add_pack(&hsr_pt); + + init_timer(&prune_timer); + prune_timer.function = prune_nodes_all; + prune_timer.data = 0; + prune_timer.expires = jiffies + msecs_to_jiffies(PRUNE_PERIOD); + add_timer(&prune_timer); + + register_netdevice_notifier(&hsr_nb); + + res = hsr_netlink_init(); + + return res; +} + +static void __exit hsr_exit(void) +{ + unregister_netdevice_notifier(&hsr_nb); + del_timer(&prune_timer); + hsr_netlink_exit(); + dev_remove_pack(&hsr_pt); +} + +module_init(hsr_init); +module_exit(hsr_exit); +MODULE_LICENSE("GPL"); diff --git a/net/hsr/hsr_main.h b/net/hsr/hsr_main.h new file mode 100644 index 0000000..56fe060 --- /dev/null +++ b/net/hsr/hsr_main.h @@ -0,0 +1,166 @@ +/* Copyright 2011-2013 Autronica Fire and Security AS + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License as published by the Free + * Software Foundation; either version 2 of the License, or (at your option) + * any later version. + * + * Author(s): + * 2011-2013 Arvid Brodin, arvid.brodin@xdin.com + */ + +#ifndef _HSR_PRIVATE_H +#define _HSR_PRIVATE_H + +#include <linux/netdevice.h> +#include <linux/list.h> + + +/* Time constants as specified in the HSR specification (IEC-62439-3 2010) + * Table 8. + * All values in milliseconds. + */ +#define HSR_LIFE_CHECK_INTERVAL 2000 /* ms */ +#define HSR_NODE_FORGET_TIME 60000 /* ms */ +#define HSR_ANNOUNCE_INTERVAL 100 /* ms */ + + +/* By how much may slave1 and slave2 timestamps of latest received frame from + * each node differ before we notify of communication problem? + */ +#define MAX_SLAVE_DIFF 3000 /* ms */ + + +/* How often shall we check for broken ring and remove node entries older than + * HSR_NODE_FORGET_TIME? + */ +#define PRUNE_PERIOD 3000 /* ms */ + + +#define HSR_TLV_ANNOUNCE 22 +#define HSR_TLV_LIFE_CHECK 23 + + +/* HSR Tag. + * As defined in IEC-62439-3:2010, the HSR tag is really { ethertype = 0x88FB, + * path, LSDU_size, sequence Nr }. But we let eth_header() create { h_dest, + * h_source, h_proto = 0x88FB }, and add { path, LSDU_size, sequence Nr, + * encapsulated protocol } instead. + */ +#define HSR_TAGLEN 6 + +/* Field names below as defined in the IEC:2010 standard for HSR. */ +struct hsr_tag { + __be16 path_and_LSDU_size; + __be16 sequence_nr; + __be16 encap_proto; +} __packed; + + +/* The helper functions below assumes that 'path' occupies the 4 most + * significant bits of the 16-bit field shared by 'path' and 'LSDU_size' (or + * equivalently, the 4 most significant bits of HSR tag byte 14). + * + * This is unclear in the IEC specification; its definition of MAC addresses + * indicates the spec is written with the least significant bit first (to the + * left). This, however, would mean that the LSDU field would be split in two + * with the path field in-between, which seems strange. I'm guessing the MAC + * address definition is in error. + */ +static inline u16 get_hsr_tag_path(struct hsr_tag *ht) +{ + return ntohs(ht->path_and_LSDU_size) >> 12; +} + +static inline u16 get_hsr_tag_LSDU_size(struct hsr_tag *ht) +{ + return ntohs(ht->path_and_LSDU_size) & 0x0FFF; +} + +static inline void set_hsr_tag_path(struct hsr_tag *ht, u16 path) +{ + ht->path_and_LSDU_size = htons( + (ntohs(ht->path_and_LSDU_size) & 0x0FFF) | (path << 12)); +} + +static inline void set_hsr_tag_LSDU_size(struct hsr_tag *ht, u16 LSDU_size) +{ + ht->path_and_LSDU_size = htons( + (ntohs(ht->path_and_LSDU_size) & 0xF000) | + (LSDU_size & 0x0FFF)); +} + +struct hsr_ethhdr { + struct ethhdr ethhdr; + struct hsr_tag hsr_tag; +} __packed; + + +/* HSR Supervision Frame data types. + * Field names as defined in the IEC:2010 standard for HSR. + */ +struct hsr_sup_tag { + __be16 path_and_HSR_Ver; + __be16 sequence_nr; + __u8 HSR_TLV_Type; + __u8 HSR_TLV_Length; +} __packed; + +struct hsr_sup_payload { + unsigned char MacAddressA[ETH_ALEN]; +} __packed; + +static inline u16 get_hsr_stag_path(struct hsr_sup_tag *hst) +{ + return get_hsr_tag_path((struct hsr_tag *) hst); +} + +static inline u16 get_hsr_stag_HSR_ver(struct hsr_sup_tag *hst) +{ + return get_hsr_tag_LSDU_size((struct hsr_tag *) hst); +} + +static inline void set_hsr_stag_path(struct hsr_sup_tag *hst, u16 path) +{ + set_hsr_tag_path((struct hsr_tag *) hst, path); +} + +static inline void set_hsr_stag_HSR_Ver(struct hsr_sup_tag *hst, u16 HSR_Ver) +{ + set_hsr_tag_LSDU_size((struct hsr_tag *) hst, HSR_Ver); +} + +struct hsr_ethhdr_sp { + struct ethhdr ethhdr; + struct hsr_sup_tag hsr_sup; +} __packed; + + +enum hsr_dev_idx { + HSR_DEV_NONE = -1, + HSR_DEV_SLAVE_A = 0, + HSR_DEV_SLAVE_B, + HSR_DEV_MASTER, +}; +#define HSR_MAX_SLAVE (HSR_DEV_SLAVE_B + 1) +#define HSR_MAX_DEV (HSR_DEV_MASTER + 1) + +struct hsr_priv { + struct list_head hsr_list; /* List of hsr devices */ + struct rcu_head rcu_head; + struct net_device *dev; + struct net_device *slave[HSR_MAX_SLAVE]; + struct list_head node_db; /* Other HSR nodes */ + struct list_head self_node_db; /* MACs of slaves */ + struct timer_list announce_timer; /* Supervision frame dispatch */ + int announce_count; + u16 sequence_nr; + spinlock_t seqnr_lock; /* locking for sequence_nr */ + unsigned char sup_multicast_addr[ETH_ALEN]; +}; + +void register_hsr_master(struct hsr_priv *hsr_priv); +void unregister_hsr_master(struct hsr_priv *hsr_priv); +bool is_hsr_slave(struct net_device *dev); + +#endif /* _HSR_PRIVATE_H */ diff --git a/net/hsr/hsr_netlink.c b/net/hsr/hsr_netlink.c new file mode 100644 index 0000000..4e66bf6 --- /dev/null +++ b/net/hsr/hsr_netlink.c @@ -0,0 +1,457 @@ +/* Copyright 2011-2013 Autronica Fire and Security AS + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License as published by the Free + * Software Foundation; either version 2 of the License, or (at your option) + * any later version. + * + * Author(s): + * 2011-2013 Arvid Brodin, arvid.brodin@xdin.com + * + * Routines for handling Netlink messages for HSR. + */ + +#include "hsr_netlink.h" +#include <linux/kernel.h> +#include <net/rtnetlink.h> +#include <net/genetlink.h> +#include "hsr_main.h" +#include "hsr_device.h" +#include "hsr_framereg.h" + +static const struct nla_policy hsr_policy[IFLA_HSR_MAX + 1] = { + [IFLA_HSR_SLAVE1] = { .type = NLA_U32 }, + [IFLA_HSR_SLAVE2] = { .type = NLA_U32 }, + [IFLA_HSR_MULTICAST_SPEC] = { .type = NLA_U8 }, +}; + + +/* Here, it seems a netdevice has already been allocated for us, and the + * hsr_dev_setup routine has been executed. Nice! + */ +static int hsr_newlink(struct net *src_net, struct net_device *dev, + struct nlattr *tb[], struct nlattr *data[]) +{ + struct net_device *link[2]; + unsigned char multicast_spec; + + if (!data[IFLA_HSR_SLAVE1]) { + netdev_info(dev, "IFLA_HSR_SLAVE1 missing!\n"); + return -EINVAL; + } + link[0] = __dev_get_by_index(src_net, nla_get_u32(data[IFLA_HSR_SLAVE1])); + if (!data[IFLA_HSR_SLAVE2]) { + netdev_info(dev, "IFLA_HSR_SLAVE2 missing!\n"); + return -EINVAL; + } + link[1] = __dev_get_by_index(src_net, nla_get_u32(data[IFLA_HSR_SLAVE2])); + + if (!link[0] || !link[1]) + return -ENODEV; + if (link[0] == link[1]) + return -EINVAL; + + if (!data[IFLA_HSR_MULTICAST_SPEC]) + multicast_spec = 0; + else + multicast_spec = nla_get_u8(data[IFLA_HSR_MULTICAST_SPEC]); + + return hsr_dev_finalize(dev, link, multicast_spec); +} + +static struct rtnl_link_ops hsr_link_ops __read_mostly = { + .kind = "hsr", + .maxtype = IFLA_HSR_MAX, + .policy = hsr_policy, + .priv_size = sizeof(struct hsr_priv), + .setup = hsr_dev_setup, + .newlink = hsr_newlink, +}; + + + +/* attribute policy */ +/* NLA_BINARY missing in libnl; use NLA_UNSPEC in userspace instead. */ +static const struct nla_policy hsr_genl_policy[HSR_A_MAX + 1] = { + [HSR_A_NODE_ADDR] = { .type = NLA_BINARY, .len = ETH_ALEN }, + [HSR_A_NODE_ADDR_B] = { .type = NLA_BINARY, .len = ETH_ALEN }, + [HSR_A_IFINDEX] = { .type = NLA_U32 }, + [HSR_A_IF1_AGE] = { .type = NLA_U32 }, + [HSR_A_IF2_AGE] = { .type = NLA_U32 }, + [HSR_A_IF1_SEQ] = { .type = NLA_U16 }, + [HSR_A_IF2_SEQ] = { .type = NLA_U16 }, +}; + +static struct genl_family hsr_genl_family = { + .id = GENL_ID_GENERATE, + .hdrsize = 0, + .name = "HSR", + .version = 1, + .maxattr = HSR_A_MAX, +}; + +static struct genl_multicast_group hsr_network_genl_mcgrp = { + .name = "hsr-network", +}; + + + +/* This is called if for some node with MAC address addr, we only get frames + * over one of the slave interfaces. This would indicate an open network ring + * (i.e. a link has failed somewhere). + */ +void hsr_nl_ringerror(struct hsr_priv *hsr_priv, unsigned char addr[ETH_ALEN], + enum hsr_dev_idx dev_idx) +{ + struct sk_buff *skb; + void *msg_head; + int res; + int ifindex; + + skb = genlmsg_new(NLMSG_GOODSIZE, GFP_ATOMIC); + if (!skb) + goto fail; + + msg_head = genlmsg_put(skb, 0, 0, &hsr_genl_family, 0, HSR_C_RING_ERROR); + if (!msg_head) + goto nla_put_failure; + + res = nla_put(skb, HSR_A_NODE_ADDR, ETH_ALEN, addr); + if (res < 0) + goto nla_put_failure; + + if (hsr_priv->slave[dev_idx]) + ifindex = hsr_priv->slave[dev_idx]->ifindex; + else + ifindex = -1; + res = nla_put_u32(skb, HSR_A_IFINDEX, ifindex); + if (res < 0) + goto nla_put_failure; + + genlmsg_end(skb, msg_head); + genlmsg_multicast(skb, 0, hsr_network_genl_mcgrp.id, GFP_ATOMIC); + + return; + +nla_put_failure: + kfree_skb(skb); + +fail: + netdev_warn(hsr_priv->dev, "Could not send HSR ring error message\n"); +} + +/* This is called when we haven't heard from the node with MAC address addr for + * some time (just before the node is removed from the node table/list). + */ +void hsr_nl_nodedown(struct hsr_priv *hsr_priv, unsigned char addr[ETH_ALEN]) +{ + struct sk_buff *skb; + void *msg_head; + int res; + + skb = genlmsg_new(NLMSG_GOODSIZE, GFP_ATOMIC); + if (!skb) + goto fail; + + msg_head = genlmsg_put(skb, 0, 0, &hsr_genl_family, 0, HSR_C_NODE_DOWN); + if (!msg_head) + goto nla_put_failure; + + + res = nla_put(skb, HSR_A_NODE_ADDR, ETH_ALEN, addr); + if (res < 0) + goto nla_put_failure; + + genlmsg_end(skb, msg_head); + genlmsg_multicast(skb, 0, hsr_network_genl_mcgrp.id, GFP_ATOMIC); + + return; + +nla_put_failure: + kfree_skb(skb); + +fail: + netdev_warn(hsr_priv->dev, "Could not send HSR node down\n"); +} + + +/* HSR_C_GET_NODE_STATUS lets userspace query the internal HSR node table + * about the status of a specific node in the network, defined by its MAC + * address. + * + * Input: hsr ifindex, node mac address + * Output: hsr ifindex, node mac address (copied from request), + * age of latest frame from node over slave 1, slave 2 [ms] + */ +static int hsr_get_node_status(struct sk_buff *skb_in, struct genl_info *info) +{ + /* For receiving */ + struct nlattr *na; + struct net_device *hsr_dev; + + /* For sending */ + struct sk_buff *skb_out; + void *msg_head; + struct hsr_priv *hsr_priv; + unsigned char hsr_node_addr_b[ETH_ALEN]; + int hsr_node_if1_age; + u16 hsr_node_if1_seq; + int hsr_node_if2_age; + u16 hsr_node_if2_seq; + int addr_b_ifindex; + int res; + + if (!info) + goto invalid; + + na = info->attrs[HSR_A_IFINDEX]; + if (!na) + goto invalid; + na = info->attrs[HSR_A_NODE_ADDR]; + if (!na) + goto invalid; + + hsr_dev = __dev_get_by_index(genl_info_net(info), + nla_get_u32(info->attrs[HSR_A_IFINDEX])); + if (!hsr_dev) + goto invalid; + if (!is_hsr_master(hsr_dev)) + goto invalid; + + + /* Send reply */ + + skb_out = genlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL); + if (!skb_out) { + res = -ENOMEM; + goto fail; + } + + msg_head = genlmsg_put(skb_out, NETLINK_CB(skb_in).portid, + info->snd_seq, &hsr_genl_family, 0, + HSR_C_SET_NODE_STATUS); + if (!msg_head) { + res = -ENOMEM; + goto nla_put_failure; + } + + res = nla_put_u32(skb_out, HSR_A_IFINDEX, hsr_dev->ifindex); + if (res < 0) + goto nla_put_failure; + + hsr_priv = netdev_priv(hsr_dev); + res = hsr_get_node_data(hsr_priv, + (unsigned char *) nla_data(info->attrs[HSR_A_NODE_ADDR]), + hsr_node_addr_b, + &addr_b_ifindex, + &hsr_node_if1_age, + &hsr_node_if1_seq, + &hsr_node_if2_age, + &hsr_node_if2_seq); + if (res < 0) + goto fail; + + res = nla_put(skb_out, HSR_A_NODE_ADDR, ETH_ALEN, + nla_data(info->attrs[HSR_A_NODE_ADDR])); + if (res < 0) + goto nla_put_failure; + + if (addr_b_ifindex > -1) { + res = nla_put(skb_out, HSR_A_NODE_ADDR_B, ETH_ALEN, + hsr_node_addr_b); + if (res < 0) + goto nla_put_failure; + + res = nla_put_u32(skb_out, HSR_A_ADDR_B_IFINDEX, addr_b_ifindex); + if (res < 0) + goto nla_put_failure; + } + + res = nla_put_u32(skb_out, HSR_A_IF1_AGE, hsr_node_if1_age); + if (res < 0) + goto nla_put_failure; + res = nla_put_u16(skb_out, HSR_A_IF1_SEQ, hsr_node_if1_seq); + if (res < 0) + goto nla_put_failure; + if (hsr_priv->slave[0]) + res = nla_put_u32(skb_out, HSR_A_IF1_IFINDEX, + hsr_priv->slave[0]->ifindex); + if (res < 0) + goto nla_put_failure; + + res = nla_put_u32(skb_out, HSR_A_IF2_AGE, hsr_node_if2_age); + if (res < 0) + goto nla_put_failure; + res = nla_put_u16(skb_out, HSR_A_IF2_SEQ, hsr_node_if2_seq); + if (res < 0) + goto nla_put_failure; + if (hsr_priv->slave[1]) + res = nla_put_u32(skb_out, HSR_A_IF2_IFINDEX, + hsr_priv->slave[1]->ifindex); + + genlmsg_end(skb_out, msg_head); + genlmsg_unicast(genl_info_net(info), skb_out, info->snd_portid); + + return 0; + +invalid: + netlink_ack(skb_in, nlmsg_hdr(skb_in), -EINVAL); + return 0; + +nla_put_failure: + kfree_skb(skb_out); + /* Fall through */ + +fail: + return res; +} + +static struct genl_ops hsr_ops_get_node_status = { + .cmd = HSR_C_GET_NODE_STATUS, + .flags = 0, + .policy = hsr_genl_policy, + .doit = hsr_get_node_status, + .dumpit = NULL, +}; + + +/* Get a list of MacAddressA of all nodes known to this node (other than self). + */ +static int hsr_get_node_list(struct sk_buff *skb_in, struct genl_info *info) +{ + /* For receiving */ + struct nlattr *na; + struct net_device *hsr_dev; + + /* For sending */ + struct sk_buff *skb_out; + void *msg_head; + struct hsr_priv *hsr_priv; + void *pos; + unsigned char addr[ETH_ALEN]; + int res; + + if (!info) + goto invalid; + + na = info->attrs[HSR_A_IFINDEX]; + if (!na) + goto invalid; + + hsr_dev = __dev_get_by_index(genl_info_net(info), + nla_get_u32(info->attrs[HSR_A_IFINDEX])); + if (!hsr_dev) + goto invalid; + if (!is_hsr_master(hsr_dev)) + goto invalid; + + + /* Send reply */ + + skb_out = genlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL); + if (!skb_out) { + res = -ENOMEM; + goto fail; + } + + msg_head = genlmsg_put(skb_out, NETLINK_CB(skb_in).portid, + info->snd_seq, &hsr_genl_family, 0, + HSR_C_SET_NODE_LIST); + if (!msg_head) { + res = -ENOMEM; + goto nla_put_failure; + } + + res = nla_put_u32(skb_out, HSR_A_IFINDEX, hsr_dev->ifindex); + if (res < 0) + goto nla_put_failure; + + hsr_priv = netdev_priv(hsr_dev); + + rcu_read_lock(); + pos = hsr_get_next_node(hsr_priv, NULL, addr); + while (pos) { + res = nla_put(skb_out, HSR_A_NODE_ADDR, ETH_ALEN, addr); + if (res < 0) { + rcu_read_unlock(); + goto nla_put_failure; + } + pos = hsr_get_next_node(hsr_priv, pos, addr); + } + rcu_read_unlock(); + + genlmsg_end(skb_out, msg_head); + genlmsg_unicast(genl_info_net(info), skb_out, info->snd_portid); + + return 0; + +invalid: + netlink_ack(skb_in, nlmsg_hdr(skb_in), -EINVAL); + return 0; + +nla_put_failure: + kfree_skb(skb_out); + /* Fall through */ + +fail: + return res; +} + + +static struct genl_ops hsr_ops_get_node_list = { + .cmd = HSR_C_GET_NODE_LIST, + .flags = 0, + .policy = hsr_genl_policy, + .doit = hsr_get_node_list, + .dumpit = NULL, +}; + +int __init hsr_netlink_init(void) +{ + int rc; + + rc = rtnl_link_register(&hsr_link_ops); + if (rc) + goto fail_rtnl_link_register; + + rc = genl_register_family(&hsr_genl_family); + if (rc) + goto fail_genl_register_family; + + rc = genl_register_ops(&hsr_genl_family, &hsr_ops_get_node_status); + if (rc) + goto fail_genl_register_ops; + + rc = genl_register_ops(&hsr_genl_family, &hsr_ops_get_node_list); + if (rc) + goto fail_genl_register_ops_node_list; + + rc = genl_register_mc_group(&hsr_genl_family, &hsr_network_genl_mcgrp); + if (rc) + goto fail_genl_register_mc_group; + + return 0; + +fail_genl_register_mc_group: + genl_unregister_ops(&hsr_genl_family, &hsr_ops_get_node_list); +fail_genl_register_ops_node_list: + genl_unregister_ops(&hsr_genl_family, &hsr_ops_get_node_status); +fail_genl_register_ops: + genl_unregister_family(&hsr_genl_family); +fail_genl_register_family: + rtnl_link_unregister(&hsr_link_ops); +fail_rtnl_link_register: + + return rc; +} + +void __exit hsr_netlink_exit(void) +{ + genl_unregister_mc_group(&hsr_genl_family, &hsr_network_genl_mcgrp); + genl_unregister_ops(&hsr_genl_family, &hsr_ops_get_node_status); + genl_unregister_family(&hsr_genl_family); + + rtnl_link_unregister(&hsr_link_ops); +} + +MODULE_ALIAS_RTNL_LINK("hsr"); diff --git a/net/hsr/hsr_netlink.h b/net/hsr/hsr_netlink.h new file mode 100644 index 0000000..d4579dc --- /dev/null +++ b/net/hsr/hsr_netlink.h @@ -0,0 +1,30 @@ +/* Copyright 2011-2013 Autronica Fire and Security AS + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License as published by the Free + * Software Foundation; either version 2 of the License, or (at your option) + * any later version. + * + * Author(s): + * 2011-2013 Arvid Brodin, arvid.brodin@xdin.com + */ + +#ifndef __HSR_NETLINK_H +#define __HSR_NETLINK_H + +#include <linux/if_ether.h> +#include <linux/module.h> +#include <uapi/linux/hsr_netlink.h> + +struct hsr_priv; + +int __init hsr_netlink_init(void); +void __exit hsr_netlink_exit(void); + +void hsr_nl_ringerror(struct hsr_priv *hsr_priv, unsigned char addr[ETH_ALEN], + int dev_idx); +void hsr_nl_nodedown(struct hsr_priv *hsr_priv, unsigned char addr[ETH_ALEN]); +void hsr_nl_framedrop(int dropcount, int dev_idx); +void hsr_nl_linkdown(int dev_idx); + +#endif /* __HSR_NETLINK_H */ |